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Finding the Fourth Proportional to 70,896,990.40, 106,345,485.60 and 42,128,317.60

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Solution

The fourth proportional to 70,896,990.40, 106,345,485.60 and 42,128,317.60 is: 63,192,476.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,896,990.40 : 106,345,485.60 = 42,128,317.60 : x
  2. Step 2: Convert to fraction form
    70,896,990.40/106,345,485.60 = 42,128,317.60/x
  3. Step 3: Cross multiply
    70,896,990.40x = 106,345,485.60 × 42,128,317.60
  4. Step 4: Simplify right side
    70,896,990.40x = 4,480,156,392,683,026.50
  5. Step 5: Solve for x
    x = 4,480,156,392,683,026.50/70,896,990.40
  6. Step 6: Final answer
    x = 63,192,476.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.